The child always has a runny nose is caused by a variety of reasons: 1, may be a cold, children’s resistance is poor, a cold is easy to catch a fever, runny nose is the most obvious symptoms of the cold, this situation should be given to the child to eat some cold medicine in a timely manner, so as not to cause aggravation. 2, rhinitis caused by some children eating the wrong things to eat, or to a strange environment does not adapt, it is easy to cause allergic rhinitis, runny nose. 3, may be nasal polyps, nasal polyps can also cause children always have a runny nose. 4, may be caused by sinusitis. 3, may be nasal polyps, nasal polyps can also cause children always runny nose. 4, may be caused by sinusitis. If it continues for a long time without improvement, you should go to the hospital in time to do the examination and treatment under the guidance of the doctor.